fix #H7385 - double trap activation when jumping

Jumping performs the placement of the last step after using hurtle()
to move to the destination, so if hurtle() triggered a trap then it
would happen twice.  Report was for a Sokoban pit but it would happen
for fire traps too.  Other traps would yield "you pass over <trap>"
while hurtling and then trigger the trap when landing.  Have
hurtle_step() ignore a trap for the last step of a jump, leaving it
to the jump's landing to handle.

Also, give feedback when hurtling over water or lava, similar to what
happens when passing over a previously seen trap which doesn't
activate.

doc/fixes36.2

@@ -114,7 +114,7 @@ add window port status_update() value BL_RESET to use as a flag to
 for hilite_status of string status fields (title, dungeon-level, alignment),
 	the types value-goes-up and -down aren't meaningful; treat them as
 	value-changed if from config file and don't offer as choices with 'O'
-spiders will occasionally spin webs when moving around
+jumping into or over a Sokoban pit, or over a fire trap, triggers trap twice
 
 
 Fixes to Post-3.6.1 Problems that Were Exposed Via git Repository
@@ -182,6 +182,7 @@ make it clear when a leprechaun dodges your attack
 wizard mode #wizidentify can now select individual items for permanent 
 	identification and don't display the selection to permanently
 	identify everything if everything is already fully identified
+spiders will occasionally spin webs when moving around
 
 
 Code Cleanup and Reorganization

src/dothrow.c

@@ -571,7 +571,7 @@ int x, y;
     int ox, oy, *range = (int *) arg;
     struct obj *obj;
     struct monst *mon;
-    boolean may_pass = TRUE;
+    boolean may_pass = TRUE, via_jumping, stopping_short;
     struct trap *ttmp;
     int dmg = 0;
 
@@ -583,6 +583,8 @@ int x, y;
     } else if (*range == 0) {
         return FALSE; /* previous step wants to stop now */
     }
+    via_jumping = (EWwalking & I_SPECIAL) != 0L;
+    stopping_short = (via_jumping && *range < 2);
 
     if (!Passes_walls || !(may_pass = may_passwall(x, y))) {
         boolean odoor_diag = (IS_DOOR(levl[x][y].typ)
@@ -710,12 +712,17 @@ int x, y;
     vision_recalc(1);  /* update for new position */
     flush_screen(1);
 
-    if (is_pool(x, y) && !u.uinwater
+    if (is_pool(x, y) && !u.uinwater) {
-        && ((Is_waterlevel(&u.uz) && levl[x][y].typ == WATER)
+        if ((Is_waterlevel(&u.uz) && levl[x][y].typ == WATER)
-            || !(Levitation || Flying || Wwalking))) {
+            || !(Levitation || Flying || Wwalking)) {
-        multi = 0; /* can move, so drown() allows crawling out of water */
+            multi = 0; /* can move, so drown() allows crawling out of water */
-        (void) drown();
+            (void) drown();
-        return FALSE;
+            return FALSE;
+        } else if (!Is_waterlevel(&u.uz) && !stopping_short) {
+            Norep("You move over %s.", an(is_moat(x, y) ? "moat" : "pool"));
+       }
+    } else if (is_lava(x, y) && !stopping_short) {
+        Norep("You move over some lava.");
     }
 
     /* FIXME:
@@ -727,7 +734,9 @@ int x, y;
      * ones that we have not yet tested.
      */
     if ((ttmp = t_at(x, y)) != 0) {
-        if (ttmp->ttyp == MAGIC_PORTAL) {
+        if (stopping_short) {
+            ; /* see the comment above hurtle_jump() */
+        } else if (ttmp->ttyp == MAGIC_PORTAL) {
             dotrap(ttmp, 0);
             return FALSE;
         } else if (ttmp->ttyp == VIBRATING_SQUARE) {
@@ -738,8 +747,10 @@ int x, y;
         } else if ((ttmp->ttyp == PIT || ttmp->ttyp == SPIKED_PIT
                     || ttmp->ttyp == HOLE || ttmp->ttyp == TRAPDOOR)
                    && Sokoban) {
-            /* Air currents overcome the recoil */
+            /* air currents overcome the recoil in Sokoban;
-            dotrap(ttmp, 0);
+               when jumping, caller performs last step and enters trap */
+            if (!via_jumping)
+                dotrap(ttmp, 0);
             *range = 0;
             return TRUE;
         } else {